If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive inde

Question

If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive inde

If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm , then the refractive index of the material of lens will be
A. 20.5 cm
B. 10 cm
C. 15.5 cm
D. 5 cm

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

Related Questions

The radius of curvature of the curved surface of a plano-convex lens is `20 cm`. If the refractive index of the material of the lens be `1.5`, it will

2 Answers 8 Views

A double convex lens (`R_(1)=R_(2)=10 cm`) having focal length equal to the focal length of a concave mirror. The radius of curvature of the concave m

2 Answers 6 Views

A plano-convex lens is made of refractive index of 1.6. The focal length of the lens is

2 Answers 5 Views

A plano convex lens has focal length `f = 20 cm`. If its plano surface is silvered, then new focal length will be.

2 Answers 4 Views

A plano-concave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?

2 Answers 8 Views

The radius of curvature of the convex face of a plano convex lens is 12cm and the refractive index of the material of the lends 1.5. Then, the focal l

2 Answers 5 Views

The focal length of lens of refractive index `1.5` in air is `30 cm` When it is immersed in water of refractive index `(4)/(3)` ,then its focal length

2 Answers 4 Views

The plane face of a plano convex lens is silvered.If `mu`be the refrative index and R, the radius of curvature of curved suraface, then system will be

2 Answers 5 Views

A convex lens of radii of curvature 20cm and 30 cm respectively. It is silvered at the surface which has smaller radius of curvature. Then it will beh

2 Answers 7 Views

A plano-convex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length `28 cm` . When its curved surface is silvere

2 Answers 5 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
(b) Focal length,F=`R/(2(µ-1))`
`rArrF=10/(2(15-1))=10cm`

5 views Answered 2023-02-05 15:29